Doorbell



FIG. 1 is a front bottom perspective view of a doorbell showing our newdesign;

FIG. 2 is a front top perspective view thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a left side view thereof;

FIG. 6 is a right side view thereof;

FIG. 7 is a top view thereof; and,

FIG. 8 is a bottom view thereof.

The dot-dash-dot lines represent the boundaries of the claim and theevenly spaced broken lines represent parts of the doorbell that form nopart of the claimed design.

CLAIM The ornamental design for a doorbell, as shown and described.